describe('practice-3-10', function () {

    it("求1、2、3、4可以组成多少个各位互不相同且不重复的三位数？", function () {
        var arr_result = unique_three_digit_number();
        console.info(arr_result);
        expect(arr_result.length).toBe(24);
        for(var i = 0;i <arr_result.length; i ++)
        {
            var str_number = arr_result[i].toString();
            expect(str_number[0]!= str_number[1]&&str_number[0]!=str_number[2]&&str_number[1]!=str_number[2]).toBe(true);
            for(var j = 0; j < i; j ++)
            {
                expect(arr_result[i]!==arr_result[j]).toBe(true);
            }
        }


    });

});
